Design formulas

Enter Width and Height for the Aspect Ratio Calculator; use finite values in the indicated domain. The calculator reports Ratio and Simplified: Aspect ratio is width divided by height. Height must be nonzero, and Width and Height must use the same unit.

Enter Pixels wide, Inches wide, Pixels tall, and Inches tall for the DPI PPI Calculator; use finite values in the indicated domain. The calculator reports Horizontal PPI and Vertical PPI: DPI/PPI = pixels ÷ inches. Inches wide and Inches tall must be positive physical measurements.

Enter Mode (0=×φ,1=÷φ) and Length for the Golden Ratio Calculator; use only the listed mode or unit codes. The calculator reports Result length: φ ≈ 1.618 relates consecutive segment lengths. Use mode 0 or 1 exactly and keep Length in the unit desired for Result length.

Enter Mode (0=px→rem,1=rem→px), Value, and Root px for the PX REM Calculator; use only the listed mode or unit codes. The calculator reports Result: rem is relative to root font size (default 16px). Root font size must be positive; browser zoom and inherited styles can change rendered size.

Enter Width px, Height px, and Scale for the Resolution Scale Calculator; use finite values in the indicated domain. The calculator reports Scaled width, Scaled height, and Megapixels: Multiply width and height by a scale factor. Scale should be nonnegative; display dimensions may need rounding to whole pixels.

Enter Width and Height for the Screen Diagonal Calculator; use finite values in the indicated domain. The calculator reports Diagonal: Diagonal is the Pythagorean hypotenuse. Width and Height must use the same unit and be nonnegative.